Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28005919c83f96a…

MALICIOUS

PDF

76.1 KB Created: 2021-03-11 18:57:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69366ad733aa1b35b4f11cc7f3e9746c SHA-1: 1e1446bca07b0feece9f92e8439cf2209096d86a SHA-256: f28005919c83f96a04eb24a42bcab4efa35899f7ecc6dec29e05b5a4ab2bbf19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which are SEO-optimized to appear as legitimate documents, but ultimately lead to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pelibifir.ru/award?keyword=central+venous+catheterization+pdf
    • http://zakomuxoza.getenjoyment.net/how_do_i_pair_my_old_xfinity_remote_with_my_tv.pdf
    • http://libuwapuvewipev.mywebcommunity.org/bronxville_school_calendar_2020_19.pdf
    • https://cdn.sqhk.co/foropogajag/goJRDuA/jojobajida.pdf
    • https://cdn.sqhk.co/kapimetavis/haKv3jj/xekifutetajap.pdf
    • https://cdn.sqhk.co/toviranevu/cgjifgJ/wunedelaxitutituvibomaseg.pdf
    • https://cdn.sqhk.co/jekunesoru/LjhgdDl/telegram_app_review_2018.pdf
    • https://cdn.sqhk.co/kolokejo/hiICigA/flip_diving_cheats_iphone.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/dorobukasawituw/53054722791.pdf
    • http://fipuxogililego.epizy.com/86525146082.pdf
    • https://uploads.strikinglycdn.com/files/43750769-620d-4a24-8e7c-ff730cfd0082/7098030266.pdf
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_1a902a37faea4097819a72388c129c7e.pdf?index=true
    • http://rerodijunenema.epizy.com/chicago_manual_of_style_guidelines_quick_study.pdf
    • https://uploads.strikinglycdn.com/files/d437e281-b5d4-436c-8c5d-39a23ed4e7d5/48411858219.pdf
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_371dbd25f9ce435b83cc8bea6b1d0966.pdf?index=true
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_dcd082eddcdd42979e525052f24fab5b.pdf?index=true
    • https://a43ab9c2-5efb-4cee-ac06-b782a0f5e207.filesusr.com/ugd/4826f5_87b6694227204f58a33de4d4e1dd02fb.pdf?index=true
    • https://s3.amazonaws.com/watajive/little_red_riding_hood_movie_animated.pdf
    • http://zepaxawom.rf.gd/68209281432.pdf
    • http://mumupaju.epizy.com/acrobat_reader_installer_offline.pdf
    • https://uploads.strikinglycdn.com/files/0ed55e1f-70e7-421c-a2df-4386a886ec07/optiplex_755_compatible_graphics_card.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed71.bin
9147d37b7f6b69d90706deb253deb74765a58d99b32dab3e23c90762b18e997b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED71 5260 bytes
font_01_sfnt_off0000ff5e.bin
560e8902d1e17bd7a313821b6e990e3b7cf8fb2889a8c88a1fa58ee24a102e82		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5E 10396 bytes

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